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Are all of the remote sets at the same location (I see port 5060). If there is more than one extension at the same location (behind a router), with no 3CX proxy server in use, each needs a unique port number.

You have the extension set to allow remote registration I assume. Is there any sign in the log of a registration attempt? You show it unregistered, which implies that it did register at one time. Some type of sets will override the registration expiry time send by 3CX, anything over 30 minutes, and it will un-register.